Roof sheets secured in the valley

[spartan]

Just got up on my new roof and was surprised to see that the rood sheets have been secured in the valleys rather than the ridges of the superdek roof sheets.

Have things changed or is this still a no no that I should be dropping a line to the BSa about?

[Wood Butcher]

As I far as I am aware this is not recommended practice. I would call the installer and get their reasons as to why they did that and maybe a call to the BSA to find out what they regard to be standard practice.

[journeyman Mick]

Spartan,
just a bit of nomeclature:
Ridge = top part of roof or hip
Valley = area of roof on an inside corner where two sections meet
Crest = high part of roof sheet profile
trough or pan = low part of roof sheet profile

I'm not familiar with this "superdek" profile but I've never come across any roofing profile that was meant to be fixed in the troughs. I'd give them a call and ask them to provide manufacturer's specs. (which I seriously doubt they'll be able to supply). A call to the BSA would be in order after this.

Mick

[ozwinner]

I thought superdeck had a special clip which is screwed to the roof timbers, then is just clipped into place?

Al

[journeyman Mick]

Al,
Kliplok and Brownbuilt profiles use a clip, never heard of superdek. Trimdek has a similar profile to the above but is screw fixed.

Mick

[bricks]

Doesnt sound like a good install to me,

[Grunt]

BSA

Bullsheet Artist?

[Wood Butcher]

Bullsheet Artist?

Queensland Building Services Authority (BSA)

[Doughboy]

QLD actually has a building standard????

Pete

[Grunt]

Bloody Stupid Arrsewipes?

[spartan]

The roof profile is trimdek, superdek is the same stuff...

To me it looks as though it has been installed as if it was for wall cladding

[Barry_White]

Although not recommended pan fixing can be successful provided 12 gauge screws are used. Pan fixing is usually done to save a few bucks but it is important the screws are not overtightened and the neoprene washers are squashed out from under the heads. The other problem is with pan fixing the laps need to fixed to stop the sheets being lifted by the wind.

If it is in a cyclone area they should be crest fixed with cyclone washers using 14 gauge screws.

As Spartan says superdek is just the same profile as Trimdek just made by a different company

[spartan]

Called BSA today, they said that the builder didn't install it correctly, however, they can only direct the builder to do something if there is a defect, I.e.the roof leaks...They adivsed me to:

1. Contact Lysaght and ask them for the spec, and the write again to the builder.
2. Lysaght responded in about 2 minutes to my e-mail, saying please find attached the manual, and if its is valley screwed then its wrong.
3. I am came home to check my roof as it was lightly raining....now last week when i had the builder out here, before I saw the roof it was leaking and he said its overflow becaue of leaves in the gutter....Well i got up there cleaned teh leaves out, and notices the screws....So with no leaves, guess what it still leaks.....So out with digital camera and snap...snap...snap.....

[Barry_White]

Called BSA today, they said that the builder didn't install it correctly, however, they can only direct the builder to do something if there is a defect, I.e.the roof leaks...They adivsed me to:

1. Contact Lysaght and ask them for the spec, and the write again to the builder.
2. Lysaght responded in about 2 minutes to my e-mail, saying please find attached the manual, and if its is valley screwed then its wrong.
3. I am came home to check my roof as it was lightly raining....now last week when i had the builder out here, before I saw the roof it was leaking and he said its overflow because of leaves in the gutter....Well i got up there cleaned the leaves out, and notices the screws....So with no leaves, guess what it still leaks.....So out with digital camera and snap...snap...snap.....

Spartan

This is the authority that I reply to this. I was a rep and a manager with Lysaghts for 11 years. I have spent a lot of years contracting in the building industry and have built and sold garages and sheds and carports and Spanline glass and screen rooms and patios.

Lysaghts also recommend pan/tray fixing of their Flat dek profile which is in their Flatdek Technical Brochure. So they are critical of their own recommendations.

I have seen many roofs pan fixed and never leaked.

The fact the roof is leaking does not mean that is necessarily because the screws are pan fixed. As I said in my earlier post if it is done properly it won't leak through the screws. Leaks in roofs come from many causes and amongst these are:

Too flatter pitch for the profile.
Sheets not weathered under the ridge cap or flashings.
Poorly designed box gutters.
Blockages by leaves and debris.

If the washers are missing from under the screws or the screws overtightened it can leak at the screws.

My advise get an independent assessor to look at it so you really know why it is leaking.

[journeyman Mick]

Barry,
I'm suprised that Lysaght is okay with pan fixed sheeting. I don't doubt you, I'm just suprised that they're okay with a technique which greatly increases the chance of leaks. Besides saving a few bucks by being able to use shorter screws (partly offset by having to screw the laps together) is there any good reason for doing so?

Mick